1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
use time::OffsetDateTime;

/// A cookie's expiration: either session or a date-time.
///
/// An `Expiration` is constructible via `Expiration::from()` with an
/// `Option<OffsetDateTime>` or an `OffsetDateTime`:
///
///   * `None` -> `Expiration::Session`
///   * `Some(OffsetDateTime)` -> `Expiration::DateTime`
///   * `OffsetDateTime` -> `Expiration::DateTime`
///
/// ```rust
/// use cookie::Expiration;
/// use time::OffsetDateTime;
///
/// let expires = Expiration::from(None);
/// assert_eq!(expires, Expiration::Session);
///
/// let now = OffsetDateTime::now_utc();
/// let expires = Expiration::from(now);
/// assert_eq!(expires, Expiration::DateTime(now));
///
/// let expires = Expiration::from(Some(now));
/// assert_eq!(expires, Expiration::DateTime(now));
/// ```
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum Expiration {
    /// Expiration for a "permanent" cookie at a specific date-time.
    DateTime(OffsetDateTime),
    /// Expiration for a "session" cookie. Browsers define the notion of a
    /// "session" and will automatically expire session cookies when they deem
    /// the "session" to be over. This is typically, but need not be, when the
    /// browser is closed.
    Session,
}

impl Expiration {
    /// Returns `true` if `self` is an `Expiration::DateTime`.
    ///
    /// # Example
    ///
    /// ```rust
    /// use cookie::Expiration;
    /// use time::OffsetDateTime;
    ///
    /// let expires = Expiration::from(None);
    /// assert!(!expires.is_datetime());
    ///
    /// let expires = Expiration::from(OffsetDateTime::now_utc());
    /// assert!(expires.is_datetime());
    /// ```
    pub fn is_datetime(&self) -> bool {
        match self {
            Expiration::DateTime(_) => true,
            Expiration::Session => false
        }
    }

    /// Returns `true` if `self` is an `Expiration::Session`.
    ///
    /// # Example
    ///
    /// ```rust
    /// use cookie::Expiration;
    /// use time::OffsetDateTime;
    ///
    /// let expires = Expiration::from(None);
    /// assert!(expires.is_session());
    ///
    /// let expires = Expiration::from(OffsetDateTime::now_utc());
    /// assert!(!expires.is_session());
    /// ```
    pub fn is_session(&self) -> bool {
        match self {
            Expiration::DateTime(_) => false,
            Expiration::Session => true
        }
    }

    /// Returns the inner `OffsetDateTime` if `self` is a `DateTime`.
    ///
    /// # Example
    ///
    /// ```rust
    /// use cookie::Expiration;
    /// use time::OffsetDateTime;
    ///
    /// let expires = Expiration::from(None);
    /// assert!(expires.datetime().is_none());
    ///
    /// let now = OffsetDateTime::now_utc();
    /// let expires = Expiration::from(now);
    /// assert_eq!(expires.datetime(), Some(now));
    /// ```
    pub fn datetime(self) -> Option<OffsetDateTime> {
        match self {
            Expiration::Session => None,
            Expiration::DateTime(v) => Some(v)
        }
    }

    /// Applied `f` to the inner `OffsetDateTime` if `self` is a `DateTime` and
    /// returns the mapped `Expiration`.
    ///
    /// # Example
    ///
    /// ```rust
    /// use cookie::Expiration;
    /// use time::{OffsetDateTime, Duration};
    ///
    /// let now = OffsetDateTime::now_utc();
    /// let one_week = Duration::weeks(1);
    ///
    /// let expires = Expiration::from(now);
    /// assert_eq!(expires.map(|t| t + one_week).datetime(), Some(now + one_week));
    ///
    /// let expires = Expiration::from(None);
    /// assert_eq!(expires.map(|t| t + one_week).datetime(), None);
    /// ```
    pub fn map<F>(self, f: F) -> Self
        where F: FnOnce(OffsetDateTime) -> OffsetDateTime
    {
        match self {
            Expiration::Session => Expiration::Session,
            Expiration::DateTime(v) => Expiration::DateTime(f(v)),
        }
    }
}

impl<T: Into<Option<OffsetDateTime>>> From<T> for Expiration {
    fn from(option: T) -> Self {
        match option.into() {
            Some(value) => Expiration::DateTime(value),
            None => Expiration::Session
        }
    }
}